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    <title>Document</title>
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        // 指定图表的配置项和数据
        var option = {
            title: {
                text: '饼图示例',
                subtext: '纯属虚构',
                left: 'center'
            },
            tooltip: {
                trigger: 'item',
                formatter: '{a} <br/>{b} : {c} ({d}%)'
            },
            legend: {
                orient: 'vertical',
                left: 'left',
            },
            series: [
                {
                    name: '访问来源',
                    type: 'pie',
                    radius: '55%',
                    data: [
                        {value: 235, name: '视频广告'},
                        {value: 274, name: '联盟广告'},
                        {value: 310, name: '邮件营销'},
                        {value: 335, name: '直接访问'},
                        {value: 400, name: '搜索引擎'}
                    ],
                    emphasis: {
                        itemStyle: {
                            shadowBlur: 10,
                            shadowOffsetX: 0,
                            shadowColor: 'rgba(0, 0, 0, 0.5)'
                        }
                    }
                }
            ]
        };

        // 使用刚指定的配置项和数据显示图表。
        myChart.setOption(option);
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